With all the right tools, references and some technical know-how, it shouldn't be an issue.
I tend to do all the simple servicing stuff myself, but where there's fabrication to be done, or internal engine work, I leave that to the pro's. I'm not a mechanic by trade (I.T actually), so I'm hesitant to do any internal work myself. I'd like to change this though and learn how! It'd save me a bucket (or trolley) load of money in the long term
'89 911 Turbo Cab
Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition